A wooden nickel American informal
To indicate a person or an object that has little or no value
Don't assess this machine as a wooden nickel, it contributes a crucial role to the manufacturing process.
That's proves nothing when Jane considers the newbie as a wooden nickel.
This television is such a wooden nickel, don't waste time repairing it.
The least amount of attention for someone or something
1. Self-praise is worthless.
2.
Used to say that doing something is always/never a wise or advantageous idea, or always/never produces a positive effect
Used to emphasize that you believe something is foolish, worthless, or untruthful